include "delayed_updating/reduction/dfr.ma".
include "delayed_updating/reduction/ifr.ma".
-include "delayed_updating/substitution/fsubst_lift.ma".
+
+include "delayed_updating/unwind/unwind2_constructors.ma".
+include "delayed_updating/unwind/unwind2_preterm_fsubst.ma".
+include "delayed_updating/unwind/unwind2_preterm_eq.ma".
+include "delayed_updating/unwind/unwind2_prototerm_lift.ma".
+include "delayed_updating/unwind/unwind2_rmap_closed.ma".
+
include "delayed_updating/substitution/fsubst_eq.ma".
-include "delayed_updating/substitution/lift_constructors.ma".
-include "delayed_updating/substitution/lift_preterm_eq.ma".
-include "delayed_updating/substitution/lift_structure_depth.ma".
-include "delayed_updating/substitution/lift_depth.ma".
+include "delayed_updating/substitution/lift_prototerm_eq.ma".
+
include "delayed_updating/syntax/prototerm_proper_constructors.ma".
+include "delayed_updating/syntax/path_closed_structure.ma".
include "delayed_updating/syntax/path_structure_depth.ma".
-include "ground/relocation/tr_uni_compose.ma".
-include "ground/relocation/tr_pap_pushs.ma".
(* DELAYED FOCUSED REDUCTION ************************************************)
-lemma tr_uni_eq_repl (n1) (n2):
- n1 = n2 โ ๐ฎโจn1โฉ โ ๐ฎโจn2โฉ.
-// qed.
-
-axiom pippo (b) (q) (n):
- โโqโ = (โ[q]๐ข)@โจnโฉ โ
- โโqโ+โbโ= (โ[bโ๐โq]๐ข)@โจn+โbโโฉ.
-
-lemma lift_rmap_tls_eq_id (p) (n):
- โpโ = โ[p]๐ข@โจnโฉ โ
- (๐ข) โ โ*[n]โ[p]๐ข.
-#p @(list_ind_rcons โฆ p) -p
-[ #n <depth_empty #H destruct
-| #p * [ #m ] #IH #n
- [ <depth_d_dx <lift_rmap_pap_d_dx #H0
- @(stream_eq_trans โฆ (lift_rmap_tls_d_dx โฆ))
- @(stream_eq_trans โฆ (IH โฆ)) -IH //
- | /2 width=1 by/
- | <depth_L_dx <lift_rmap_L_dx
- cases n -n [| #n ] #H0
- [
- |
- ]
- | /2 width=1 by/
- | /2 width=1 by/
- ]
-]
-
-
-(* (โโqโ+โbโ=โ[bโ๐โq]๐ข@โจn+โbโโฉ *)
-(* [โ[p]๐ข@โจnโฉ]โซฏ*[โpโ]fโโ*[n]โ[p]๐ข) *)
-lemma lift_rmap_tls_eq (f) (p) (n):
- โpโ = โ[p]๐ข@โจnโฉ โ
- f โ โ*[n]โ[p]f.
-#f #p #n #Hp
-@(stream_eq_canc_dx โฆ (stream_tls_eq_repl โฆ))
-[| @lift_rmap_decompose | skip ]
-<tr_compose_tls <Hp
-
-@(stream_eq_canc_dx) โฆ (lift_rmap_decompose โฆ))
+(* Main destructions with ifr ***********************************************)
-lemma dfr_lift_bi (f) (p) (q) (t1) (t2): t1 ฯต ๐ โ
- t1 โก๐๐[p,q] t2 โ โ[f]t1 โก๐[โp,โq] โ[f]t2.
-#f #p #q #t1 #t2 #H0t1
-* #b #n * #Hb #Hn #Ht1 #Ht2
-@(ex1_2_intro โฆ (โb) (โโโqโ)) @and4_intro
-[ //
-| #g <lift_rmap_structure <depth_structure
- >tr_pushs_swap <tr_pap_pushs_le //
-| lapply (in_comp_lift_bi f โฆ Ht1) -Ht1 -H0t1 -Hb -Ht2
- <lift_path_d_empty_dx //
-| lapply (lift_term_eq_repl_dx f โฆ Ht2) -Ht2 #Ht2
+theorem dfr_des_ifr (f) (t1) (t2) (r): t1 ฯต ๐ โ
+ t1 โก๐๐[r] t2 โ โผ[f]t1 โก๐ข๐[โr] โผ[f]t2.
+#f #t1 #t2 #r #H0t1
+* #p #q #n #Hr #Hn #Ht1 #Ht2 destruct
+@(ex4_3_intro โฆ (โp) (โq) (โญq))
+[ -H0t1 -Hn -Ht1 -Ht2 //
+| -H0t1 -Ht1 -Ht2
+ /2 width=2 by path_closed_structure_depth/
+| lapply (in_comp_unwind2_path_term f โฆ Ht1) -Ht2 -Ht1 -H0t1
+ <unwind2_path_d_dx <tr_pap_succ_nap <list_append_rcons_sn
+ <nap_unwind2_rmap_append_closed_Lq_dx_depth //
+| lapply (unwind2_term_eq_repl_dx f โฆ Ht2) -Ht2 #Ht2
@(subset_eq_trans โฆ Ht2) -t2
- @(subset_eq_trans โฆ (lift_fsubst โฆ))
- [ <lift_rmap_append <lift_rmap_A_sn (* <lift_rmap_append <lift_rmap_L_sn *)
- <structure_append <structure_A_sn <structure_append <structure_L_sn
- <depth_append <depth_L_sn <depth_structure <depth_structure
- @fsubst_eq_repl [ // ]
- @(subset_eq_trans โฆ (lift_iref โฆ))
+ @(subset_eq_trans โฆ (unwind2_term_fsubst_ppc โฆ))
+ [ @fsubst_eq_repl [ // | // ]
+ @(subset_eq_trans โฆ (unwind2_term_irefโฆ))
@(subset_eq_canc_sn โฆ (lift_term_eq_repl_dx โฆ))
- [ @lift_grafted_S /2 width=2 by ex_intro/ | skip ]
- @(subset_eq_trans โฆ (lift_term_after โฆ))
- @(subset_eq_canc_dx โฆ (lift_term_after โฆ))
- @lift_term_eq_repl_sn -t1
- @(stream_eq_trans โฆ (tr_compose_uni_dx โฆ))
- lapply (Hn (๐ข)) -Hn >tr_id_unfold #Hn
- lapply (pippo โฆ b โฆ Hn) -Hn #Hn
+ [ @unwind2_term_grafted_S /2 width=2 by ex_intro/ | skip ] -Ht1
+ @(subset_eq_trans โฆ (lift_unwind2_term_after โฆ))
+ @unwind2_term_eq_repl_sn
+(* Note: crux of the proof begins *)
+ <list_append_rcons_sn
+ @(stream_eq_trans โฆ (tr_compose_uni_dx_pap โฆ)) <tr_pap_succ_nap
@tr_compose_eq_repl
- [ <lift_rmap_pap_le //
- <Hn <nrplus_inj_sn //
- |
+ [ <nap_unwind2_rmap_append_closed_Lq_dx_depth //
+ | /2 width=2 by tls_succ_unwind2_rmap_append_closed_Lq_dx/
]
+(* Note: crux of the proof ends *)
| //
| /2 width=2 by ex_intro/
| //
]
]
+qed.